http://www.mdpi.com/journal/futureinternet/special_issues/wireless-systems/ Evolving communication paradigms such as mobile ad hoc, mesh, and sensor networks as well as peer-to-peer applications demand for novel security solutions. Due to the changed characteristics compared to today's networks, these systems are beyond the protection of (most of) today's security mechanisms. New approaches that are able to handle the challenging conditions have to be developed. In this process, the mutual influence of security and quality of service/experience has to be considered as an integral element. This way, coexistence of security and performance can be achieved in order to further catalyze the evolution. Ralf Steinmetz André König Guest Editors Submission Information All papers should be submitted to futureinternet@mdpi.com. To be published continuously until the deadline and papers will be listed together at the special issue website. Submitted papers should not have been published nor be under consideration for publication elsewhere. All papers are refereed through a peer-review process. A guide for authors is available on the Instructions for Authors page. Future Internet is a new international, peer-reviewed, quarterly open access journal published by MDPI. Open Access publication is free of charge in the first few issues to be published in 2009. http://www.mdpi.com/1999-5903/2/3/212/ Recent advances in the fields of Cognitive Radio and the proliferation of open spectrum access promise that spectrum-agile wireless communication will be widespread in the near future, and will bring significant flexibility and potential utility improvements for end users. With spectrum efficiency being a key objective, most relevant research focuses on smart coexistence mechanisms. However, wireless nodes may behave selfishly and should be considered as rational autonomous entities. Selfishness, pure malice or even faulty equipment can lead to behavior that does not conform to sharing protocols and etiquette. Thus, there is a need to secure spectrum sharing mechanisms against attacks in the various phases of the sharing process. Identifying these attacks and possible countermeasures is the focus of this work. http://www.mdpi.com/1999-5903/2/3/212/ Thu, 29 Jul 2010 00:00:00 CEST Future Internet 2010-07-29 2 3 Review 212 237 1999-5903 Misbehavior Scenarios in Cognitive Radio Networks 2010-07-29 doi: 10.3390/fi2030212 Stamatios Arkoulis Giannis F. Marias Pantelis A. Frangoudis Jens Oberender Alexandru Popescu Markus Fiedler Hermann de Meer George C. Polyzos http://www.mdpi.com/1999-5903/2/3/190/ Pervasive wireless systems have significantly improved end-users’ quality of life. As manufacturing costs decrease, communications bandwidth increases, and contextual information is made more readily available, the role of next generation wireless systems in facilitating users’ daily activities will grow. Unique security and privacy issues exist in these wireless, context-aware, often decentralized systems. For example, the pervasive nature of such systems allows adversaries to launch stealthy attacks against them. In this review paper, we survey several emergent personal wireless systems and their applications. These systems include mobile social networks, active implantable medical devices, and consumer products. We explore each system’s usage of contextual information and provide insight into its security vulnerabilities. Where possible, we describe existing solutions for defendingagainst these vulnerabilities. Finally, we point out promising future research directions for improving these systems’ robustness and security http://www.mdpi.com/1999-5903/2/3/190/ Wed, 28 Jul 2010 00:00:00 CEST Future Internet 2010-07-28 2 3 Article 190 211 1999-5903 Applications and Security of Next-Generation, User-Centric Wireless Systems 2010-07-28 doi: 10.3390/fi2030190 Jerry Rick Ramstetter Yaling Yang Danfeng Yao http://www.mdpi.com/1999-5903/2/2/96/ Wireless Sensor Networks (WSNs) are gradually adopted in the industrial world due to their advantages over wired networks. In addition to saving cabling costs, WSNs widen the realm of environments feasible for monitoring. They thus add sensing and acting capabilities to objects in the physical world and allow for communication among these objects or with services in the future Internet. However, the acceptance of WSNs by the industrial automation community is impeded by open issues, such as security guarantees and provision of Quality of Service (QoS). To examine both of these perspectives, we select and survey relevant WSN technologies dedicated to industrial automation. We determine QoS requirements and carry out a threat analysis, which act as basis of our evaluation of the current state-of-the-art. According to the results of this evaluation, we identify and discuss open research issues. http://www.mdpi.com/1999-5903/2/2/96/ Thu, 08 Apr 2010 00:00:00 CEST Future Internet 2010-04-08 2 2 Article 96 125 1999-5903 Survey on Wireless Sensor Network Technologies for Industrial Automation: The Security and Quality of Service Perspectives 2010-04-08 doi: 10.3390/fi2020096 Christin Mogre Hollick http://www.mdpi.com/1999-5903/2/1/30/ Data hiding techniques have so far concentrated on adding or modifying irrelevant information in order to hide a message. However, files in widespread use, such as HTML documents, usually exhibit high redundancy levels, caused by code-generation programs. Such redundancy may be removed by means of optimization software. Redundancy removal, if applied selectively, enables information hiding. This work introduces Selective Redundancy Removal (SRR) as a framework for hiding data. An example application of the framework is given in terms of hiding information in HTML documents. Non-uniformity across documents may raise alarms. Nevertheless, selective application of optimization techniques might be due to the legitimate use of optimization software not supporting all the optimization methods, or configured to not use all of them. http://www.mdpi.com/1999-5903/2/1/30/ Mon, 15 Feb 2010 00:00:00 CET Future Internet 2010-02-15 2 1 Communication 30 40 1999-5903 Selective Redundancy Removal: A Framework for Data Hiding 2010-02-15 doi: 10.3390/fi2010030 Ugo Fiore